Machine for holding rivets during upsetting.



W. H. DIFFENDALL.

MACHINE FUR HOLDING RIVEIS DURING UPsE'ITING.

A APPLICATION FILED MAR. 28. 1917.

l. ,g' mtented Nov.. 20, 191?.

WALTER H. DIFFENDALL, 0F HAGERSTOWN, MARYLAND.

MACHINE FOR HOLDING RIVETS DURING PSETTING.

Larissa.,

Specification of Letters Patent.

Patented Nov.. 20, Mbit."

Application filed March 28, 1917. Serial No. 158,032.

.To all whom it may concern.:

Be it known that l, `WALTER H. DIFFEN- DALL, a citizen'of the United States, residing at Hagerstown, in the countyof `Washing ton and State of Maryland, have invented certain new, and useful Improvements in Machines for Holding Rivets During Upsetting; and I hereby declare that the fol lowing is a full, clear, and exactdescription thereof, reference being had totheaccorn-V panying drawings, which form part of this specification.

This invention is a novel machineespecially designed for use in riveting the back flue sheet or fire box sheet of boilers in place; but useful in other places where it is necessary to hold rivet heads during the operation of upsetting the ends of their shanks.

'.llie object of this invention is to provide a novel machine having a dolly bar or holding on bar, which can be readily adjusted to engage the die head of the dolly bar with the head of the rivet, and then can apply a constant pressure to the dolly bar sutlicient to hold the rivet-head iirmly in place during the upsetting of the shank of the rivet by hammering.

l will describe one embodiment of the invention as illustrated in the accompanying drawings to enable others to understand and use the same; but the invention does not reside in the specilic'form or construction of parts illustrated in said drawings, as such embodiment of the invention is capable of modilication and change while retaining the essential features of the invention; and therefore the features and combinations of parts for which protection is desired are summarized in the claims following such description.

in the drawings:

Figure l is a side elevation of a machine embodying the invention, applied to the back flue head of a boiler with the dolly bar in position to hold a rivet. i

\ Fig. 2 is a front view of the machine removed.`

Fig. 3 is a lower end view of the machine.

Figl is an enlarged vertical sectional view on line 3-3 Fig. 1. i

The machine shown has a dolly bar, or holding on bar l. having one -end la bent approximately at right angles. to the main body thereof and forming a die head pref-p` erably provided in its inner side with one or more die-sinks lb each adapted to lit the head of a rivet. The other end portion of thc dplly bar is preferably formed into a yo e A iiuid pressure cylinder 2 is preferably disposed within the yoke of the dolly-bar and in axial alinement with the body of the said bar. Said cylinder 2 may be attached at one end in any suitable manner, (as by means of a stud bolt 2a and nut 3a) to an arm of a bracket or abutment 3 of any suitable kind, which can be fastened to a stable support when the machine is in use.

The bracket 3 may be detachably attached to the back-flue-head S of a boiler by any suitable means. As shown it is secured by means of a bolt 4 passed through one of the flue holes in the head. Said bolt has a head lb slightly smaller in diameter than the flue-holes in the head S and has a shoulder la next the headfsmaller than the head and shorter than the thickness of the sheet, and said bolt has a reduced threaded shank 4 engaging an opening in the bracket 3 as shown, and adapted to be engaged by a nut die, to detachably fasten the bracket to the flue-head as shown in Fig. l. This bolt can be readily engaged with any flue hole from the outside of the sheet, and the bracket 3 can be tightly clamped to the flue sheet at any desired point.

Within the cylinder 2 is a piston 5 slidably fitted therein and which may be provided with suitable packing rings 5 to prevent leakage of fluid.

A ring 6 is preferably screwed into the lower end of cylinder 2 as shown in Fig. 4, to guide the piston 5 in its movement and prevent the piston 5 falling out of the cylinder when adjustments are being made.

To the outer end of piston 5 is preferably detachably attached a guide member which in the construction shown has a shank 7, a body 7:t and a pin 7". The shank 7 of said member enters an opening in the reduced outer end of the piston; the body 7 a is interposed between the piston and the outer end of bar le of the yoke; and the pin 7b passes through an opening in the end bar 1e of the yoke and guides the piston relatively to the yoke, and enables the yoke and piston to be readily engaged or disengaged. The body 7:L has an annular groove 7 which is engaged by spring lingers 9a attached to a fee retaining ring. 9 engaging a' groove 5.inthe/ outer end of the piston. Said guide meinber 7b serves to keep the dolly-bar 1 in line with piston 5 when thepairts are in opera-V tive position.

Washers 8 may be "strung on pin 7b betweenthe body 7a and the end bar to vary the'nornal distance between the die head1* of the dolly bar and the cylinder When the machine is in Working position.

Compressed: air or other actuating duid Inly be admitted. into the cylinder 2 between the pistoir and the closed end ofthe cytf inder through a portec Whenit isldesired to force the piston out ofthe cylinder. Such duid may be supplied by a pipe 10 connected to any suitable supplyV of' tin-idY under pres'- s'ure; said pipe having-a suitable controlln-gval've.

Operation.

In usingthe machine for riyeting tine head sheets to boilers as indica-ted in Fig. 1-

the bracket 3 is iirst detachably attached te the back fitte head by means or' bolt Ll as indicated in Fig. l. The lower end bar' le. or the yoke of the dolly bar is then engaged with the pin 71" and the die head or endV 1a or theI dolly-bar is hookedover the top sheet.A

A rivet is the-n put in place, and the head 1 shifted to engage one or the dies l with the rivet head. Fluid'is then admittedV into the cylinder' so as to nrove the piston outi'vard (and thus vtorce the dolly-bar downivar'd,)' or in a direction aiva'y' from the head l, thus putting great pressure upon the rivet-.head and holding the same securely While' the innerv end of its shank is being siviged. lVhen the machine lis in place as shown in Fig. l the dolly bar can be shifted toeither side to engage a succession of rivets Without having to relocate the bracket after each operation.

The machine can be operated in any posi tion; the dolly bar can' be quickly shifted from one position to another to engage dif-4 ferentv rivets 1in different sections of the seani or sealns Within its range. Preferably tlieihead la of the dolly bar has two dies 1b; but can be provided With as many dies 'as is necessary to have one or the other reach rivn ets in diii'erent portions of the seam. For use on an ordinary locor'noth'e boiler tivo dies in the head would be sufficient.

. The machine can be used to hold rivets Where the rivet head cannot be seen by the operator; and by its use, niany rivets necessaryto` complete such seams perfectly, can

be properly fastened-,that could not be` done' by any other dolly. The machine can also be used in vWater-legs by b'o'lting bracket 3 through staybolt holes.

rIhe-niacliine 'saves time and labor; the

rvetng'operation can be performed more quickly and 1n a more workmanhke manner tharris possible ivitlr the usual. method of holding a die by hand tools.

vWhat I claim is: Y l. In combination a adapted to engage a rivet head; a cylinder; a piston in tliecylinder, ineans vdetachably connecting the said piston With the said bar,

means fordetachably fastening the cylin- V der to ai support fixed relatively to the rivet to be headed, and means for admitting Huid into the cylinder whereby thepi'ston ejected the bar moved to rmlyhold the' rivet head.

2; machine' for purpose specified comprising `Ya bar having one endl bent atv right angles and provided 'with .die sink tolengage a rivet, a piston eoni'iected with said bar, a c'ylinderadapted. to ibeengaged bythe piston., means forl detachabiy attzh` ing' 'said cylinder to a support fixed relative'- to said bar,... means fcrgadmittiug fluid into said cylinder.

SWA. rnaehine comprising a cylinder,f means for detachabl-y attaching said cylinder to a support, a bar having one bent at right angles'fto' en# gage a rivet, av piston. insaid cylinder.7 a rne'inber connected 'with 'saidban means detachably connecting said member with thepi'ston, and means. for admitting Yfluid into said cylinder.

4'. machine for thefpurpose specified comprising a bar having-one en d adapted. to;

engage a rivet head and its other end providedwith an opening; a cylinderfnreans for detachably. attaching said cylinderf to a support fixe-d, relatively` to the rivet','a.piston in said cylinder, a member engaging the piston and'having a vpin engaging the Vopening in the end rof the bar, and-'means for admitting iiuidi intosaid cylinder.

5*. machine for the purposeY specifiedA comprising. a bar having one .end bent.` at.

right angles to engage a rivet head and its other endroit-med into av yoke, a cylinder adapted to be locatedWithin-the yoke, meansr for detachably attaching said cylinder to a support fined. relatively to the rivet, a pis? right angles and provided With: a die sink to engage a rivet, and its otherend'having a yoke provided With an opening in its end; ai cylinder adapted to be Alocated Within the yoke, means `for det-achablyV attaching said cylinder to a support Viixed Vrelatively tothe rivet, a'piston in `said cylinder,V aV mernber having a portion engaging the Vvpiston and a pin engaging theopening in the end-of the yoke, means detachably. connecting said tor the purposeV speciedj bar having a part soY member with the piston, and means for adrelatively to the rivet to be headed, and mitting fluid into the cylinder. means for admitting fluid into the cylinder 7. In combination, a bar'having a part whereby the piston is ejected and the bar 10 adapted to engage a rivet head; a cylinder; caused to rmly hold the rivet head. 5 a piston in the cylinder, means connecting In testimony that I claim the foregoing as the said piston With the said bar; means for my own, I aix my signature. fastening the cylinder t0 a support fixed WALTER I-I. DIFFENDALL.

Jopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patente, Washington, D. C. 

